A computer program was developed to assist the determination of minimum tunnel diameters for electrified rapid transit systems. Inputs include vehicle shape, walkway location, clearances, and track geometrics. The program written in FORTRAN IV calculates the locations of six critical points with respect to the top of the low rail. Twenty triplets of points are considered, each triplet defining a possible circle. Circles not containing all six points are discarded and the minimum-diameter circle is selected. An additional plotting option is available to provide a visual presentation of tunnel, vehicle envelope, and walkway envelope.

  • Availability:
  • Supplemental Notes:
    • Co-sponsors of this report were the Office of the Assistant Secretary for Systems Development and Technology, and the Urban Mass Transportation Administration, under contract to Transportation Systems Center, Cambridge, Massachusetts.
  • Corporate Authors:

    Bechtel Corporation

    50 Beale Street
    San Francisco, CA  United States  94119
  • Authors:
    • Wyman, F P
    • Hefland, H J
  • Publication Date: 1976-1

Media Info

  • Pagination: 104 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00148590
  • Record Type: Publication
  • Source Agency: Department of Transportation
  • ISBN: DOT-TSC-UMTA-75-24
  • Report/Paper Numbers: DOT-TSC-OST-75-49 Final Rpt., UMTA-MA-06-0025-7518
  • Contract Numbers: DOT-TSC-601
  • Files: TRIS, USDOT
  • Created Date: Mar 15 1981 12:00AM